RTP Payload Format for Flexible Forward Error Correction (FEC)
draft-ietf-payload-flexible-fec-scheme-13

Document Type Active Internet-Draft (payload WG)
Last updated 2018-12-11
Stream IETF
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Stream WG state WG Document (wg milestone: May 2018 - Submit RTP Payload F... )
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PAYLOAD                                                        M. Zanaty
Internet-Draft                                                     Cisco
Intended status: Standards Track                                V. Singh
Expires: June 14, 2019                                      callstats.io
                                                                A. Begen
                                                         Networked Media
                                                              G. Mandyam
                                                           Qualcomm Inc.
                                                       December 11, 2018

     RTP Payload Format for Flexible Forward Error Correction (FEC)
               draft-ietf-payload-flexible-fec-scheme-13

Abstract

   This document defines new RTP payload formats for the Forward Error
   Correction (FEC) packets that are generated by the non-interleaved
   and interleaved parity codes from source media encapsulated in RTP.
   These parity codes are systematic codes, where a number of FEC repair
   packets are generated from a set of source packets from one or more
   source RTP streams.  These FEC repair packets are sent in a
   redundancy RTP stream separate from the source RTP stream(s) that
   carries the source packets.  RTP source packets that were lost in
   transmission can be reconstructed using the source and repair packets
   that were received.  The non-interleaved and interleaved parity codes
   which are defined in this specification offer a good protection
   against random and bursty packet losses, respectively, at a cost of
   decent complexity.  The RTP payload formats that are defined in this
   document address scalability issues experienced with the earlier
   specifications, and offer several improvements.  Due to these
   changes, the new payload formats are not backward compatible with
   earlier specifications, but endpoints that do not implement this
   specification can still work by simply ignoring the FEC repair
   packets.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Zanaty, et al.            Expires June 14, 2019                 [Page 1]
Internet-Draft      RTP Payload Format for Parity FEC      December 2018

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 14, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Parity Codes  . . . . . . . . . . . . . . . . . . . . . .   4
       1.1.1.  1-D Non-interleaved (Row) FEC Protection  . . . . . .   5
       1.1.2.  1-D Interleaved (Column) FEC Protection . . . . . . .   5
       1.1.3.  Use Cases for 1-D FEC Protection  . . . . . . . . . .   6
       1.1.4.  2-D (Row and Column) FEC Protection . . . . . . . . .   8
       1.1.5.  FEC Overhead Considerations . . . . . . . . . . . . .   9
   2.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   9
   3.  Definitions and Notations . . . . . . . . . . . . . . . . . .  10
     3.1.  Definitions . . . . . . . . . . . . . . . . . . . . . . .  10
     3.2.  Notations . . . . . . . . . . . . . . . . . . . . . . . .  10
   4.  Packet Formats  . . . . . . . . . . . . . . . . . . . . . . .  11
     4.1.  Source Packets  . . . . . . . . . . . . . . . . . . . . .  11
     4.2.  FEC Repair Packets  . . . . . . . . . . . . . . . . . . .  11
       4.2.1.  RTP Header of FEC Repair Packets  . . . . . . . . . .  12
       4.2.2.  FEC Header of FEC Repair Packets  . . . . . . . . . .  14
   5.  Payload Format Parameters . . . . . . . . . . . . . . . . . .  18
     5.1.  Media Type Registration - Parity Codes  . . . . . . . . .  19
       5.1.1.  Registration of audio/flexfec . . . . . . . . . . . .  19
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